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GRIFFIN HOOK/HACKLE GAUGE This handy gauge fits most vise stms. To determine hackle size, simply bend the hackle around the pin at the bottom of the gauge. The hackle will flare out and the tips will indicate on the curved graph the correct size hackle. To determine hook size, simply place the hook on the hooks pictured on the gaug. This gauge will rotate freely on the vise stem so it may be swung out of the way when not in use. It will correctly identify size 4-22 hackles and 4-16 hook sizes.